fixed a comment

Author: KarimAly12

inference_engine_algorithms/forward_chaining.py

@@ -2,7 +2,6 @@
 The forward-chaining algorithm PL-FC-ENTAILS? (KB, q) determines if a single proposition
 symbol q—the query—is entailed by a knowledge base of definite clauses. It begins from
 known facts (positive literals) in the knowledge base.
-known facts (positive literals) in the knowledge base.
 
 Reference: https://dl.ebooksworld.ir/books/Artificial.Intelligence.A.Modern.Approach.4th.Edition.Peter.Norvig.%20Stuart.Russell.Pearson.9780134610993.EBooksWorld.ir.pdf